Sigma-delta modulator with an adjustable feedback factor

In a sigma-delta modulator the feedback circuit (4, 5) has an adjustable feedback factor controlled by an adjusting member (6) for adjusting the feedback factor of the feedback circuit.

Impedance matching circuit for a multi-band radio frequency device

In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Low power, no deadzone phase frequency detector with charge pump

In a frequency synthesizer with a phase locked loop a charge pump (2) is present with an idle path (5-C, 6-C, 7, 8). The idle path (5-C, 6-C, 7, 8) is activated only shortly before an up or down pulse appears at an output (15, 16) of a phase frequency detector (1) and the idle path (5-C, 6-C, 7, 8) is disabled shortly after the disappearance of an up or down signal. Means (20) to generate a signal for controlling the enablement and disablement of the idle path (5-C, 6-C, 7, 8) may comprise a down-counter divider (30) or a zipper divider (35).

Circuit arrangement and method for sigma-delta conversion with reduced idle tones

The circuit arrangement has a sigma-delta converter ( 2 ) for converting an analog input signal into a digital output signal. The sigma-delta converter ( 2 ) contains a loop filter, a comparator connected downstream of the latter and a feedback loop to feed the output signal back to the input signal. To reduce idle tones a dither signal is fed to the comparator by means of a dither-signal line ( 27.1 ). The dither signal is not however generated by a complex dither-signal generator. Instead, what is used as a dither signal is a signal that is available in the circuit but is not specifically generated for this purpose, e.g. an output signal from a second sigma-delta converter ( 2 '). The circuit arrangement is thus simpler and less expensive than conventional circuit arrangements without its reduction of idle tones suffering.

Versatile baseband signal input current splitter

A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) may be steered to a dummy load (103), a mixer for a first band (106), and a mixer for a second band (108). In one example, five different loads are provided, one dummy load (103) and two different loads (105, 107) for each band. Possibilities include: 1. All current steered into dummy load via transistor A; 2. All current steered into Band 1 mixer via transistor B; 3. All current steered into a Band 1 mixer via transistor C, causing 6 dB input signal amplification; 4. All current steered into Band 2 mixer via transistor E; 5. All current steered into a Band 2 mixer via transistor D, causing 6 dB input signal amplification; 6. Like cases 2-5 but with diversion of some portion of current via a dummy load for attenuation of input signal in 1 dB steps.

Impedeance matching circuit for a multi-band radio frequency device

In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Impedance matching circuit for a multi-band radio frequency device

In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Baseband signal input current splitter

A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (in) are steered to a dummy load, a mixer for a first band, and at least one other mixer for a second band. The mechanism is structured to selectively apportion a current input signal between multiple paths of the same polarity having respective load circuits and concurrently steer different proportions of the current input signal to a dummy load path and at least one mixer path.

Versatile baseband signal input current splitter

A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current ("in") may be steered to a dummy load (103), a mixer for a first band (106), and a mixer for a second band (108). In one example, five different loads are provided, one dummy load (103) and two different loads (105, 107) for each band. Possibilities include: 1. All current steered into dummy load via transistor A; 2. All current steered into Band 1 mixer via transistor B; 3. All current steered into a Band 1 mixer via transistor C, causing 6 dB input signal amplification; 4. All current steered into Band 2 mixer via transistor E; 5. All current steered into a Band 2 mixer via transistor D, causing 6 dB input signal amplification; 6. Like cases 2-5 but with diversion of some portion of current via a dummy load for attenuation of input signal in 1 dB steps.

Management of coexistence of communicating sub-systems in wireless devices

A method of calibrating coexistence of several wirelessly communicating sub-systems within a wireless device wherein the wirelessly communicating sub-systems comprise several transmitters and several receivers which are interconnected through one or more interfaces, the method comprising:—activating one of the transmitters while maintaining the other transmitters off by causing said transmitter to transmit a first signal with a known set of characteristics;—measuring unwanted signal received at each receiver and originating from a coupling of said receivers with the activated transmitter;—storing coupling data derived from each of the measured unwanted signals in relation with the set of signal characteristics of the first signal and/or a set of unwanted signal characteristics, whereby forming a calibration database for adjusting operation of one or more transmitters and/or receivers to manage the coexistence of the plurality of wirelessly communicating sub-systems during normal operation of the wireless device.

BASEBAND SIGNAL INPUT CURRENT SPLITTER

A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) are steered to a dummy load, a mixer for a first band, and at least one other mixer for a second band. The mechanism is structured to selectively apportion a current input signal between multiple paths of the same polarity having respective load circuits and concurrently steer different proportions of the current input signal to a dummy load path and at least one mixer path.

Circuit arrangement and method for sigma-delta conversion with reduced idle tones

The circuit arrangement has a sigma-delta converter ( 2 ) for converting an analog input signal into a digital output signal. The sigma-delta converter ( 2 ) contains a loop filter, a comparator connected downstream of the latter and a feedback loop to feed the output signal back to the input signal. To reduce idle tones a dither signal is fed to the comparator by means of a dither-signal line ( 27.1 ). The dither signal is not however generated by a complex dither-signal generator. Instead, what is used as a dither signal is a signal that is available in the circuit but is not specifically generated for this purpose, e.g. an output signal from a second sigma-delta converter ( 2 ′). The circuit arrangement is thus simpler and less expensive than conventional circuit arrangements without its reduction of idle tones suffering.

Semiconductor chip with internal ESD matching

Semiconductor chip comprising a high frequency (RF) circuit (2) and a chip being provided with a plurality of bonding pads (4) and an on chip electric static discharge protection (ESD) circuit (3), in which chip each circuit (2, 3) is connected with a separate bonding pad (4), an inductive connection being provided between said pads (4).

Sigma-delta modulator with an adjustable feedback factor

In a sigma-delta modulator the feedback circuit (4, 5) has an adjustable feedback factor controlled by an adjusting member (6) for adjusting the feedback factor of the feedback circuit.

Low power, no deadzone phase frequency detector with charge pump

In a frequency synthesizer with a phase locked loop a charge pump ( 2 ) is present with an idle path ( 5 -C, 6 -C, 7, 8 ). The idle path ( 5 -C, 6 -C, 7, 8 ) is activated only shortly before an up or down pulse appears at an output ( 15, 16 ) of a phase frequency detector ( 1 ) and the idle path ( 5 -C, 6 -C, 7, 8 ) is disabled shortly after the disappearance of an up or down signal. Means ( 20 ) to generate a signal for controlling the enablement and disablement of the idle path ( 5 -C, 6 -C, 7, 8 ) may comprise a down-counter divider ( 30 ) or a zipper divider ( 35 ).

Impedeance matching circuit for a multi-band radio frequency device

In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Management of Coexistence of Communicating Sub-Systems in Wireless Devices

A method of calibrating coexistence of several wirelessly communicating sub-systems within a wireless device wherein the wirelessly communicating sub-systems comprise several transmitters and several receivers which are interconnected through one or more interfaces, the method comprising:—activating one of the transmitters while maintaining the other transmitters off by causing said transmitter to transmit a first signal with a known set of characteristics;—measuring unwanted signal received at each receiver and originating from a coupling of said receivers with the activated transmitter;—storing coupling data derived from each of the measured unwanted signals in relation with the set of signal characteristics of the first signal and/or a set of unwanted signal characteristics, whereby forming a calibration database for adjusting operation of one or more transmitters and/or receivers to manage the coexistence of the plurality of wirelessly communicating sub-systems during normal operation of the wireless device.

Method and Wireless Mobile Station for Beacon Scanning in WLAN

There is described a method of and a wireless mobile station for performing a beacon scanning of wireless Access Points, APs, in a wireless local area network, WLAN, the wireless mobile station comprising:—a unit configured for entering a low power mode of beacon scanning in which a beacon signal detection unit is active and a signal decoding unit is not active;—a unit configured for scanning simultaneously a set of channels;—a unit configured for recording within a list information regarding time of presence of beacon signal power;—a unit configured for leaving the low power mode of beacon scanning and activating the decoding unit responsive to presence of beacon signal power having been detected; and,—a unit configured for decoding the detected channels. 1. method of performing a beacon scanning of wireless Access Points , APs , in a wireless local area network , WLAN , the method comprising:entering a low power mode of beacon scanning in which a beacon signal detection unit is active and a signal decoding unit is not active, at the beginning of a first channel scanning time window;scanning simultaneously a set of channels during the first channel scanning time window in the low power mode of beacon scanning;recording within a list, at least information regarding time of presence of beacon signal power detected in the set of channels during the first channel scanning time window in the low power mode of beacon scanning;leaving the low power mode of beacon scanning and activating at least the decoding unit at the end of the first channel scanning time window responsive to presence of beacon signal power having been detected within the set of channels in the low power mode of beacon scanning; and,decoding, using the list and during a second channel scanning time window subsequent to the first beacon scanning time window, the channels for which beacon signal power has been detected in the low power mode of beacon scanning.2. The method according to claim 1 , wherein ...

I/O cell calibration

signal

SIGMA-DELTA MODULATOR WITH ADJUSTABLE FEEDBACK FACTOR

Impedance matching circuit for a multi-band radio frequency device

In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Impedanzanpassungsschaltung für ein mehrbandradiogerät

Shift register circuit arrangement with improved compatibility and method of operating it

The shift register circuit arrangement (1), or a finite-impulse-response-digital-digital-to-analog converter for audio technology respectively, comprises a plurality of sequentially cascaded flip-flops (3.1,..., 3.n) connected together in pairs by a data line (2), which elements can be clocked by a clock signal over a clock signal line (7). The flip-flops (3.1,..., 3.n) are then connected together in pairs in series by the clock signal line (7). The connection of the flip-flops (3.1,..., 3n) by the clock signal line (7) is such that a signal on the data line (2) and the clock signal propagate in opposite directions to adhere to the necessary setup and hold times. Due to the delay, which occurs in each flip-flop (3.1,..., 3n), the flip-flops (3.1,..., 3n) are not clocked simultaneously, so that only slight power impulses are developed on the supply lines. Therefore, the circuit arrangement (1) has improved electromagnetic compatibility without separate delay circuits being necessary.

Phase frequency detector having instantaneous phase difference output

A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal containing a measure which is proportional to said detected phase difference, and having capacitor means for providing the detector output signal whose measure depends instantaneously on said detected phase difference. This allows a loop filter which is present in a phase locked loop to have reduced averaging properties and to have a broader bandwidth resulting in a cleaner output frequency signal of a voltage controlled oscillator in the phase locked loop.

Sigma-delta modulator mit einstellbarem rückkopplungsfaktor

Circuit arrangement and method for sigma-delta conversion with reduced idle tones

Management of coexistence of communicating sub-systems in wireless devices

A method of calibrating coexistence of several wirelessly communicating sub- systems within a wireless device wherein the wirelessly communicating sub-systems comprise several transmitters and several receivers which are interconnected through one or more interfaces, the method comprising: - activating one of the transmitters while maintaining the other transmitters off by causing said transmitter to transmit a first signal with a known set of characteristics; - measuring unwanted signal received at each receiver and originating from a coupling of said receivers with the activated transmitter; - storing coupling data derived from each of the measured unwanted signals in relation with the set of signal characteristics of the first signal and/or a set of unwanted signal characteristics, whereby forming a calibration database for adjusting operation of one or more transmitters and/or receivers to manage the coexistence of the plurality of wirelessly communicating sub-systems during normal operation of the wireless device.

Vielseitiger splitter für basisband-stromeingangs-signal

Leistungsarmer phasen- und frequenzdetektor mit ladungspumpe und ohne totbereich

Low power, no deadzone phase frequency detector with charge pump

In a frequency synthesizer with a phase locked loop a charge pump (2) is present with an idle path (5-C, 6-C, 7, 8). The idle path (5-C, 6-C, 7, 8) is activated only shortly before an up or down pulse appears at an output (15, 16) of a phase frequency detector (1) and the idle path (5-C, 6-C, 7, 8) is disabled shortly after the disappearance of an up or down signal. Means (20) to generate a signal for controlling the enablement and disablement of the idle path (5-C, 6-C, 7, 8) may comprise a down-counter divider (30) or a zipper divider (35).

Leistungsarmer phasen- und frequenzdetektor mit ladungspumpe und ohne totbereich

Shift register circuit arrangement with improved compatibility and method of operating it

Method and wireless mobile station for beacon scanning in wlan

There is described a method of, and a wireless mobile station for performing a beacon scanning of wireless Access Points, APs, in a wireless local area network, WLAN, the wireless mobile station comprising: - a unit configured for entering a low power mode of beacon scanning in which a beacon signal detection unit is active and a signal decoding unit is not active; - a unit configured for scanning simultaneously a set of channels; - a unit configured for recording within a list information regarding time of presence of beacon signal power; - a unit configured for leaving the low power mode of beacon scanning and activating the decoding unit responsive to presence of beacon signal power having been detected; and, - a unit configured for decoding the detected channels.

Im Abluft- oder Umluftbetrieb betreibbare Vorrichtung für ein Labor

Laborabzug oder Sicherheitswerkbank (1) für ein Labor, der bzw. die bei bestimmungsgemäßen Gebrauch im Abluft- oder Umluftbetrieb betrieben wird, aufweisend ein Gehäuse (60), in dem sich ein Arbeitsraum befindet, der vorderseitig zumindest teilweise von einem in horizontaler Richtung beweglich angeordneten Querschieber (31), bodenseitig von einer Bodenplatte (34), seitlich jeweils von einer Seitenwand (36) und rückseitig von einer Rückwand (40) begrenzt ist, wobei der Querschieber (31) mit einem Antriebsmittel (92, 94) gekoppelt ist, das betriebsmäßig bewirkt, dass der Querschieber (31) sich von einer ersten horizontalen Position in eine zweite horizontale Position bewegt.